http://www.liesegang.com/index3.php?wai=1

German firm founded about 1854 by Friedrich Wilhelm Eduard Liesegang in Wuppertal. He was a manufacturer of lanterns, slides and photographic apparatus. After his father's death in 1871 his son Johann Paul Eduard took over the firm and transferred it to Düsseldorf were he started to make projecting apparatus and sell a wide range of magic lantern slides.

Nowadays the company still exists as Liesegang Technology Vertriebsgesellschaft mbH, located in Essen.